Transcript 1A2 Geography 9th March 2015

1A2 Geography
th
9 March 2015
Objective: to introduce students to the
formation and uses of sedimentary rock
Homework:
O Textbook, page 92, Q. 2 (i) & (ii), and Q. 3 (i)
& (ii).
O Name the category of rock that limestone
belongs to, and name a location where
limestone is found.
O Name two rocks, describe one use for each.
KWL
What we know
What we want to
know
All rocks differ
according to:
1. Mineral content.
2.
3.
4.
________________
There are three
groups of rock:
1.
2.
3. Metamorphic.
What is
sedimentary rock?
How is it formed?
Examples of
sedimentary rock?
What we have
learned
Sedimentary Rock
O Rock that formed from sediments (remains)
of dead plants and animals, and other rock.
O Deposited (dropped) on sea and lake beds,
as well as on land.
O Layers built up over time.
O These layers were compressed (squeezed)
and cemented creating solid rock.
Sedimentary Rock: Sandstone
O Sand was worn away from the crust.
O Carried by wind and water.
O Deposited on beds of seas and lakes, and
on land.
O Layers built-up and were compressed
together to form sandstone.
O (Show rock and sand samples).
Sedimentary Rock: Sandstone
O Colour: Red, purple, brown, grey, and white.
O Texture: Course grained – it is a rough rock!
O Uses: Construction industry. Used to make
patios and floor tiles.
O Location: Galtee Mountains (Cork), and
MacGillicuddy’s Reeks (Kerry).
Sedimentary Rock: Limestone
O Remains of dead plants and animals
(including fossils & shells) deposited on the
bottom of warm, shallow sea.
O Layers built up over millions of years.
O Weight compressed these sediments into
layers of solid rock.
O Easily worn away by water! Flowing water
can erode through it (permeable). It is also
easily dissolved (soluble) – see example.
Sedimentary Rock: Limestone
O Colour: Grey.
O Texture: Very soft. Easily worn away by water.
O Uses: Construction industry (lime used to
make cement). Agriculture (ground lime is
very good for the soil – increases fertility).
O Location: The Burren, Co. Clare.
Sedimentary Rock: Coal
O Is coal an example of a sedimentary rock?
O Why isn’t this rock used in the construction
industry?
O It’s a valuable fossil fuel!
KWL
What we know
What we want to
know
What we have
learned
All rocks differ
according to:
1. Mineral content.
2. Texture.
3. Hardness.
4. Colour.
________________
There are three
groups of rock:
1. Igneous.
2. Sedimentary.
3. Metamorphic.
What is
sedimentary rock?
Formed from sediments.
How is it formed?
Examples of
sedimentary rock?
Layers build-up, are
compressed and form
solid rock.
Limestone: grey, used in
construction/ farming.
Easily dissolved. Found in
the Burren.
Sandstone: Variety of
colours, used in
construction, found in
mountains in the South.
Coal is a sedimentary rock.